People die in wars. There is no way to prevent every civilian causality, especially when they are hanging out with combatants in the same house or room.
I would be more inclined to accept this statement if the majority of people killed in the conflict were actually enemy combatants. The reality is the vast majority of people killed in Iraq and Afghanistan have been civilians, and the protocol for selecting targets and carrying out their remote executions has been constantly criticized for being incredibly careless. I've seen multiple testimonies that they often target people for drone strikes just because they're suspected of being somewhat connected to some terrorist activity, and that's enough to justify methods of killing that will result in several civilians being killed for every suspected terrorist. And then there's the part where they have the drones hang around and shoot down first responders to the attack, such as ambulances that come and try to tend to that collateral damage.
Our war conduct for the last 10 years has been terrorism in every sense of the word, and Obama hasn't improved anything at all over Bush.
While the vast majority of deaths in Iraq/ Afghanistan have been civilians, it wasn't the US or it's allies killing them. Both are civil wars with the foreigners in the middle, it's not some one-sided occupation. Also, you mistake what a 'first responder' is in this case. The insurgents will recover their own, they have burial requirements and have to be put in the ground within 24 hours of death. 9 times out of 10 it's other insurgents recovering their buddy, nobody else is really going to know where they were. It's not some civilian ambulance, they don't even really have those in Iraq and Afghanistan and they never responded to war causalities anyways. No ambulance is going to come bouncing over the bomb craters and past the tanks to go get some bits and pieces of some dead guy that was blown up with a missile.
I'm not sure where they get their information for their targets in the 'drone war' but one problem that came up I believe is that, these tribal people in afghanistan and whatnot all really fucking hate each other and they have these feuds that last for generations. This is really very common. So what happens is one family will claim to be ratting out the Taliban and convince these intelligence people that some important Talib guy is at this house, to have their neighbor blown up or raided and the Americans claim another victory. Presumably, they vet their information a little better then that, but I would not be surprised if this happens more often then they'd like.
After all, the official story for entering the Iraq war was given by an extremely sketchy Iraqi informant named 'Curveball' that fabricated all that crap about mobile chemical weapon factories and all, in the hopes of getting out of Iraq. The man was a chemist by trade and so he knew details that made for a convincing case. I'd not be surprised if this kind of thing still happens.